Im 17, my boyfriend and I had unprotected sex about a month ago. (stupid I know) I was on my period. About a week afterwards, I noticed some light blood when I went to the bathroom. But I knew it wasn't my period, cause I had just gotten off it. Ive also been experiencing some frequent back pains, one time it hurt so bad it made me cry. Its about a week before my next period and I'm getting cramps, is this another possible sign, or am I just getting ready to start my period a little early?

Its really hard to tell until you've missed a period. If you miss your period, wait about a week and then take an HPT, it should be able to be picked up by then if you are pregnant :)

It's possible that you are pregnant because you engaged in unprotected sex and the spotting you noticed could have possibly been implantation bleeding. Yes, back pain and cramps can be a sign of early pregnancy but don't count on it for they can be signs of your period coming as well. If you miss your period, take a HPT. Good luck!